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A 5.3-Million-Year History of Monsoonal Precipitation in Northwestern Australia

Stuut, JBW; De Deckker, P; Saavedra-Pellitero, M; Bassinot, F; Drury, AJ; Walczak, MH; Nagashima, K; (2019) A 5.3-Million-Year History of Monsoonal Precipitation in Northwestern Australia. Geophysical Research Letters , 46 (12) pp. 6946-6954. 10.1029/2019GL083035. Green open access

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Abstract

New proxy records from deep‐sea sediment cores from the northwestern continental margin of Western Australian reveal a 5.3 million year (Ma) history of aridity and tropical monsoon activity in northwestern Australia. Following the warm and dry early Pliocene (~5.3 Ma), the northwestern Australian continent experienced a gradual increase in humidity peaking at about 3.8 Ma with higher than present‐day rainfall. Between 3.8 and about 2.8 Ma, climate became progressively more arid with more rainfall variability. Coinciding with the onset of the Northern Hemisphere glaciations and the intensification of the Northern Hemisphere monsoon, aridity continued to increase overall from 2.8 Ma until today, with greater variance in precipitation and an increased frequency of large rainfall events. We associate the observed large‐scale fluctuations in Australian aridity with variations in Indian Ocean sea surface temperatures, which largely control the monsoonal precipitation in northwestern Australia.

Type: Article
Title: A 5.3-Million-Year History of Monsoonal Precipitation in Northwestern Australia
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2019GL083035
Publisher version: https://doi.org/10.1029/2019GL083035
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: paleoclimate, monsoon, Australia, runoff, Pliocene, Quaternary
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10077890
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